<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>菜鸟教程(runoob.com)</title>
  <style>
    div.img {
      border: 1px solid #ccc;
    }

    div.img:hover {
      border: 1px solid #777;
    }

    div.img img {
      width: 100%;
      height: auto;
    }

    div.desc {
      padding: 15px;
      text-align: center;
    }

    * {
      box-sizing: border-box;
    }

    .responsive {
      padding: 0 6px;
      float: left;
      width: 24.99999%;
    }

    @media only screen and (max-width: 700px){
      .responsive {
        width: 49.99999%;
        margin: 6px 0;
      }
    }

    @media only screen and (max-width: 500px){
      .responsive {
        width: 100%;
      }
    }

    .clearfix:after {
      content: "";
      display: table;
      clear: both;
    }
  </style>
</head>
<body>

<h2 style="text-align:center">响应式图片相册</h2>

<div class="responsive">
  <div class="img">
    <a target="_blank" href="img_fjords.jpg">
      <img src="//www.runoob.com/wp-content/uploads/2016/04/img_fjords.jpg" alt="Trolltunga Norway" width="300" height="200">
    </a>
    <div class="desc">Add a description of the image here</div>
  </div>
</div>


<div class="responsive">
  <div class="img">
    <a target="_blank" href="img_forest.jpg">
      <img src="//www.runoob.com/wp-content/uploads/2016/04/img_forest.jpg" alt="Forest" width="600" height="400">
    </a>
    <div class="desc">Add a description of the image here</div>
  </div>
</div>

<div class="responsive">
  <div class="img">
    <a target="_blank" href="img_lights.jpg">
      <img src="//www.runoob.com/wp-content/uploads/2016/04/img_lights.jpg" alt="Northern Lights" width="600" height="400">
    </a>
    <div class="desc">Add a description of the image here</div>
  </div>
</div>

<div class="responsive">
  <div class="img">
    <a target="_blank" href="img_mountains.jpg">
      <img src="//www.runoob.com/wp-content/uploads/2016/04/img_mountains.jpg" alt="Mountains" width="600" height="400">
    </a>
    <div class="desc">Add a description of the image here</div>
  </div>
</div>

<div class="clearfix"></div>

<div style="padding:6px;">

  <h4>重置浏览器大小查看效果</h4>
</div>

</body>
</html>
